72561652 has 6 divisors (see below), whose sum is σ = 126982898. Its totient is φ = 36280824.

The previous prime is 72561649. The next prime is 72561653. The reversal of 72561652 is 25616527.

It can be written as a sum of positive squares in only one way, i.e., 62789776 + 9771876 = 7924^2 + 3126^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72561653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070203 + ... + 9070210.

Almost surely, 2^72561652 is an apocalyptic number.

It is an amenable number.

72561652 is a deficient number, since it is larger than the sum of its proper divisors (54421246).

72561652 is a wasteful number, since it uses less digits than its factorization.

72561652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18140417 (or 18140415 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 72561652 is about 8518.3127437304. The cubic root of 72561652 is about 417.0957076833.

The spelling of 72561652 in words is "seventy-two million, five hundred sixty-one thousand, six hundred fifty-two".